The Part An Actor Played

It Is Probably Safe To Say That All The Changes Of Factual Knowledge Which Have Led To The Relativity Theory, Resulting In A Very Great Theoretical Development, Are Completely Trivial From Any Point Of View Except Their Relevance To The Structure Of A Theoretical System.

A Theoretical System Does Not Merely State Facts Which Have Been Observed And That Logically Deducible Relations To Other Facts Which Have Also Been Observed.

Sociology Should... Be Thought Of As A Science Of Action-of The Ultimate Common Value Element In Its Relations To The Other Elements Of Action.

Theory Not Only Formulates What We Know But Also Tells Us What We Want To Know, That Is, The Questions To Which An Answer Is Needed.

The Implications Of These Considerations Justify The Statement That All Empirically Verifiable Knowledge Even The Commonsense Knowledge Of Everyday Life - Involves Implicitly, If Not Explicitly, Systematic Theory In This Sense.